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[deliverable/linux.git] / kernel / trace / trace_output.c
1 /*
2 * trace_output.c
3 *
4 * Copyright (C) 2008 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
5 *
6 */
7
8 #include <linux/module.h>
9 #include <linux/mutex.h>
10 #include <linux/ftrace.h>
11
12 #include "trace_output.h"
13
14 /* must be a power of 2 */
15 #define EVENT_HASHSIZE 128
16
17 DECLARE_RWSEM(trace_event_mutex);
18
19 DEFINE_PER_CPU(struct trace_seq, ftrace_event_seq);
20 EXPORT_PER_CPU_SYMBOL(ftrace_event_seq);
21
22 static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly;
23
24 static int next_event_type = __TRACE_LAST_TYPE + 1;
25
26 int trace_print_seq(struct seq_file *m, struct trace_seq *s)
27 {
28 int len = s->len >= PAGE_SIZE ? PAGE_SIZE - 1 : s->len;
29 int ret;
30
31 ret = seq_write(m, s->buffer, len);
32
33 /*
34 * Only reset this buffer if we successfully wrote to the
35 * seq_file buffer.
36 */
37 if (!ret)
38 trace_seq_init(s);
39
40 return ret;
41 }
42
43 enum print_line_t trace_print_bprintk_msg_only(struct trace_iterator *iter)
44 {
45 struct trace_seq *s = &iter->seq;
46 struct trace_entry *entry = iter->ent;
47 struct bprint_entry *field;
48 int ret;
49
50 trace_assign_type(field, entry);
51
52 ret = trace_seq_bprintf(s, field->fmt, field->buf);
53 if (!ret)
54 return TRACE_TYPE_PARTIAL_LINE;
55
56 return TRACE_TYPE_HANDLED;
57 }
58
59 enum print_line_t trace_print_printk_msg_only(struct trace_iterator *iter)
60 {
61 struct trace_seq *s = &iter->seq;
62 struct trace_entry *entry = iter->ent;
63 struct print_entry *field;
64 int ret;
65
66 trace_assign_type(field, entry);
67
68 ret = trace_seq_printf(s, "%s", field->buf);
69 if (!ret)
70 return TRACE_TYPE_PARTIAL_LINE;
71
72 return TRACE_TYPE_HANDLED;
73 }
74
75 /**
76 * trace_seq_printf - sequence printing of trace information
77 * @s: trace sequence descriptor
78 * @fmt: printf format string
79 *
80 * It returns 0 if the trace oversizes the buffer's free
81 * space, 1 otherwise.
82 *
83 * The tracer may use either sequence operations or its own
84 * copy to user routines. To simplify formating of a trace
85 * trace_seq_printf is used to store strings into a special
86 * buffer (@s). Then the output may be either used by
87 * the sequencer or pulled into another buffer.
88 */
89 int
90 trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
91 {
92 int len = (PAGE_SIZE - 1) - s->len;
93 va_list ap;
94 int ret;
95
96 if (s->full || !len)
97 return 0;
98
99 va_start(ap, fmt);
100 ret = vsnprintf(s->buffer + s->len, len, fmt, ap);
101 va_end(ap);
102
103 /* If we can't write it all, don't bother writing anything */
104 if (ret >= len) {
105 s->full = 1;
106 return 0;
107 }
108
109 s->len += ret;
110
111 return 1;
112 }
113 EXPORT_SYMBOL_GPL(trace_seq_printf);
114
115 /**
116 * trace_seq_vprintf - sequence printing of trace information
117 * @s: trace sequence descriptor
118 * @fmt: printf format string
119 *
120 * The tracer may use either sequence operations or its own
121 * copy to user routines. To simplify formating of a trace
122 * trace_seq_printf is used to store strings into a special
123 * buffer (@s). Then the output may be either used by
124 * the sequencer or pulled into another buffer.
125 */
126 int
127 trace_seq_vprintf(struct trace_seq *s, const char *fmt, va_list args)
128 {
129 int len = (PAGE_SIZE - 1) - s->len;
130 int ret;
131
132 if (s->full || !len)
133 return 0;
134
135 ret = vsnprintf(s->buffer + s->len, len, fmt, args);
136
137 /* If we can't write it all, don't bother writing anything */
138 if (ret >= len) {
139 s->full = 1;
140 return 0;
141 }
142
143 s->len += ret;
144
145 return len;
146 }
147 EXPORT_SYMBOL_GPL(trace_seq_vprintf);
148
149 int trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary)
150 {
151 int len = (PAGE_SIZE - 1) - s->len;
152 int ret;
153
154 if (s->full || !len)
155 return 0;
156
157 ret = bstr_printf(s->buffer + s->len, len, fmt, binary);
158
159 /* If we can't write it all, don't bother writing anything */
160 if (ret >= len) {
161 s->full = 1;
162 return 0;
163 }
164
165 s->len += ret;
166
167 return len;
168 }
169
170 /**
171 * trace_seq_puts - trace sequence printing of simple string
172 * @s: trace sequence descriptor
173 * @str: simple string to record
174 *
175 * The tracer may use either the sequence operations or its own
176 * copy to user routines. This function records a simple string
177 * into a special buffer (@s) for later retrieval by a sequencer
178 * or other mechanism.
179 */
180 int trace_seq_puts(struct trace_seq *s, const char *str)
181 {
182 int len = strlen(str);
183
184 if (s->full)
185 return 0;
186
187 if (len > ((PAGE_SIZE - 1) - s->len)) {
188 s->full = 1;
189 return 0;
190 }
191
192 memcpy(s->buffer + s->len, str, len);
193 s->len += len;
194
195 return len;
196 }
197
198 int trace_seq_putc(struct trace_seq *s, unsigned char c)
199 {
200 if (s->full)
201 return 0;
202
203 if (s->len >= (PAGE_SIZE - 1)) {
204 s->full = 1;
205 return 0;
206 }
207
208 s->buffer[s->len++] = c;
209
210 return 1;
211 }
212
213 int trace_seq_putmem(struct trace_seq *s, const void *mem, size_t len)
214 {
215 if (s->full)
216 return 0;
217
218 if (len > ((PAGE_SIZE - 1) - s->len)) {
219 s->full = 1;
220 return 0;
221 }
222
223 memcpy(s->buffer + s->len, mem, len);
224 s->len += len;
225
226 return len;
227 }
228
229 int trace_seq_putmem_hex(struct trace_seq *s, const void *mem, size_t len)
230 {
231 unsigned char hex[HEX_CHARS];
232 const unsigned char *data = mem;
233 int i, j;
234
235 if (s->full)
236 return 0;
237
238 #ifdef __BIG_ENDIAN
239 for (i = 0, j = 0; i < len; i++) {
240 #else
241 for (i = len-1, j = 0; i >= 0; i--) {
242 #endif
243 hex[j++] = hex_asc_hi(data[i]);
244 hex[j++] = hex_asc_lo(data[i]);
245 }
246 hex[j++] = ' ';
247
248 return trace_seq_putmem(s, hex, j);
249 }
250
251 void *trace_seq_reserve(struct trace_seq *s, size_t len)
252 {
253 void *ret;
254
255 if (s->full)
256 return 0;
257
258 if (len > ((PAGE_SIZE - 1) - s->len)) {
259 s->full = 1;
260 return NULL;
261 }
262
263 ret = s->buffer + s->len;
264 s->len += len;
265
266 return ret;
267 }
268
269 int trace_seq_path(struct trace_seq *s, struct path *path)
270 {
271 unsigned char *p;
272
273 if (s->full)
274 return 0;
275
276 if (s->len >= (PAGE_SIZE - 1)) {
277 s->full = 1;
278 return 0;
279 }
280
281 p = d_path(path, s->buffer + s->len, PAGE_SIZE - s->len);
282 if (!IS_ERR(p)) {
283 p = mangle_path(s->buffer + s->len, p, "\n");
284 if (p) {
285 s->len = p - s->buffer;
286 return 1;
287 }
288 } else {
289 s->buffer[s->len++] = '?';
290 return 1;
291 }
292
293 s->full = 1;
294 return 0;
295 }
296
297 const char *
298 ftrace_print_flags_seq(struct trace_seq *p, const char *delim,
299 unsigned long flags,
300 const struct trace_print_flags *flag_array)
301 {
302 unsigned long mask;
303 const char *str;
304 const char *ret = p->buffer + p->len;
305 int i;
306
307 for (i = 0; flag_array[i].name && flags; i++) {
308
309 mask = flag_array[i].mask;
310 if ((flags & mask) != mask)
311 continue;
312
313 str = flag_array[i].name;
314 flags &= ~mask;
315 if (p->len && delim)
316 trace_seq_puts(p, delim);
317 trace_seq_puts(p, str);
318 }
319
320 /* check for left over flags */
321 if (flags) {
322 if (p->len && delim)
323 trace_seq_puts(p, delim);
324 trace_seq_printf(p, "0x%lx", flags);
325 }
326
327 trace_seq_putc(p, 0);
328
329 return ret;
330 }
331 EXPORT_SYMBOL(ftrace_print_flags_seq);
332
333 const char *
334 ftrace_print_symbols_seq(struct trace_seq *p, unsigned long val,
335 const struct trace_print_flags *symbol_array)
336 {
337 int i;
338 const char *ret = p->buffer + p->len;
339
340 for (i = 0; symbol_array[i].name; i++) {
341
342 if (val != symbol_array[i].mask)
343 continue;
344
345 trace_seq_puts(p, symbol_array[i].name);
346 break;
347 }
348
349 if (!p->len)
350 trace_seq_printf(p, "0x%lx", val);
351
352 trace_seq_putc(p, 0);
353
354 return ret;
355 }
356 EXPORT_SYMBOL(ftrace_print_symbols_seq);
357
358 const char *
359 ftrace_print_hex_seq(struct trace_seq *p, const unsigned char *buf, int buf_len)
360 {
361 int i;
362 const char *ret = p->buffer + p->len;
363
364 for (i = 0; i < buf_len; i++)
365 trace_seq_printf(p, "%s%2.2x", i == 0 ? "" : " ", buf[i]);
366
367 trace_seq_putc(p, 0);
368
369 return ret;
370 }
371 EXPORT_SYMBOL(ftrace_print_hex_seq);
372
373 #ifdef CONFIG_KRETPROBES
374 static inline const char *kretprobed(const char *name)
375 {
376 static const char tramp_name[] = "kretprobe_trampoline";
377 int size = sizeof(tramp_name);
378
379 if (strncmp(tramp_name, name, size) == 0)
380 return "[unknown/kretprobe'd]";
381 return name;
382 }
383 #else
384 static inline const char *kretprobed(const char *name)
385 {
386 return name;
387 }
388 #endif /* CONFIG_KRETPROBES */
389
390 static int
391 seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address)
392 {
393 #ifdef CONFIG_KALLSYMS
394 char str[KSYM_SYMBOL_LEN];
395 const char *name;
396
397 kallsyms_lookup(address, NULL, NULL, NULL, str);
398
399 name = kretprobed(str);
400
401 return trace_seq_printf(s, fmt, name);
402 #endif
403 return 1;
404 }
405
406 static int
407 seq_print_sym_offset(struct trace_seq *s, const char *fmt,
408 unsigned long address)
409 {
410 #ifdef CONFIG_KALLSYMS
411 char str[KSYM_SYMBOL_LEN];
412 const char *name;
413
414 sprint_symbol(str, address);
415 name = kretprobed(str);
416
417 return trace_seq_printf(s, fmt, name);
418 #endif
419 return 1;
420 }
421
422 #ifndef CONFIG_64BIT
423 # define IP_FMT "%08lx"
424 #else
425 # define IP_FMT "%016lx"
426 #endif
427
428 int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
429 unsigned long ip, unsigned long sym_flags)
430 {
431 struct file *file = NULL;
432 unsigned long vmstart = 0;
433 int ret = 1;
434
435 if (s->full)
436 return 0;
437
438 if (mm) {
439 const struct vm_area_struct *vma;
440
441 down_read(&mm->mmap_sem);
442 vma = find_vma(mm, ip);
443 if (vma) {
444 file = vma->vm_file;
445 vmstart = vma->vm_start;
446 }
447 if (file) {
448 ret = trace_seq_path(s, &file->f_path);
449 if (ret)
450 ret = trace_seq_printf(s, "[+0x%lx]",
451 ip - vmstart);
452 }
453 up_read(&mm->mmap_sem);
454 }
455 if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
456 ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
457 return ret;
458 }
459
460 int
461 seq_print_userip_objs(const struct userstack_entry *entry, struct trace_seq *s,
462 unsigned long sym_flags)
463 {
464 struct mm_struct *mm = NULL;
465 int ret = 1;
466 unsigned int i;
467
468 if (trace_flags & TRACE_ITER_SYM_USEROBJ) {
469 struct task_struct *task;
470 /*
471 * we do the lookup on the thread group leader,
472 * since individual threads might have already quit!
473 */
474 rcu_read_lock();
475 task = find_task_by_vpid(entry->tgid);
476 if (task)
477 mm = get_task_mm(task);
478 rcu_read_unlock();
479 }
480
481 for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
482 unsigned long ip = entry->caller[i];
483
484 if (ip == ULONG_MAX || !ret)
485 break;
486 if (ret)
487 ret = trace_seq_puts(s, " => ");
488 if (!ip) {
489 if (ret)
490 ret = trace_seq_puts(s, "??");
491 if (ret)
492 ret = trace_seq_puts(s, "\n");
493 continue;
494 }
495 if (!ret)
496 break;
497 if (ret)
498 ret = seq_print_user_ip(s, mm, ip, sym_flags);
499 ret = trace_seq_puts(s, "\n");
500 }
501
502 if (mm)
503 mmput(mm);
504 return ret;
505 }
506
507 int
508 seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
509 {
510 int ret;
511
512 if (!ip)
513 return trace_seq_printf(s, "0");
514
515 if (sym_flags & TRACE_ITER_SYM_OFFSET)
516 ret = seq_print_sym_offset(s, "%s", ip);
517 else
518 ret = seq_print_sym_short(s, "%s", ip);
519
520 if (!ret)
521 return 0;
522
523 if (sym_flags & TRACE_ITER_SYM_ADDR)
524 ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
525 return ret;
526 }
527
528 /**
529 * trace_print_lat_fmt - print the irq, preempt and lockdep fields
530 * @s: trace seq struct to write to
531 * @entry: The trace entry field from the ring buffer
532 *
533 * Prints the generic fields of irqs off, in hard or softirq, preempt
534 * count and lock depth.
535 */
536 int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
537 {
538 int hardirq, softirq;
539 int ret;
540
541 hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
542 softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
543
544 if (!trace_seq_printf(s, "%c%c%c",
545 (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
546 (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ?
547 'X' : '.',
548 (entry->flags & TRACE_FLAG_NEED_RESCHED) ?
549 'N' : '.',
550 (hardirq && softirq) ? 'H' :
551 hardirq ? 'h' : softirq ? 's' : '.'))
552 return 0;
553
554 if (entry->preempt_count)
555 ret = trace_seq_printf(s, "%x", entry->preempt_count);
556 else
557 ret = trace_seq_putc(s, '.');
558
559 if (!ret)
560 return 0;
561
562 if (entry->lock_depth < 0)
563 return trace_seq_putc(s, '.');
564
565 return trace_seq_printf(s, "%d", entry->lock_depth);
566 }
567
568 static int
569 lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
570 {
571 char comm[TASK_COMM_LEN];
572
573 trace_find_cmdline(entry->pid, comm);
574
575 if (!trace_seq_printf(s, "%8.8s-%-5d %3d",
576 comm, entry->pid, cpu))
577 return 0;
578
579 return trace_print_lat_fmt(s, entry);
580 }
581
582 static unsigned long preempt_mark_thresh = 100;
583
584 static int
585 lat_print_timestamp(struct trace_seq *s, u64 abs_usecs,
586 unsigned long rel_usecs)
587 {
588 return trace_seq_printf(s, " %4lldus%c: ", abs_usecs,
589 rel_usecs > preempt_mark_thresh ? '!' :
590 rel_usecs > 1 ? '+' : ' ');
591 }
592
593 int trace_print_context(struct trace_iterator *iter)
594 {
595 struct trace_seq *s = &iter->seq;
596 struct trace_entry *entry = iter->ent;
597 unsigned long long t = ns2usecs(iter->ts);
598 unsigned long usec_rem = do_div(t, USEC_PER_SEC);
599 unsigned long secs = (unsigned long)t;
600 char comm[TASK_COMM_LEN];
601
602 trace_find_cmdline(entry->pid, comm);
603
604 return trace_seq_printf(s, "%16s-%-5d [%03d] %5lu.%06lu: ",
605 comm, entry->pid, iter->cpu, secs, usec_rem);
606 }
607
608 int trace_print_lat_context(struct trace_iterator *iter)
609 {
610 u64 next_ts;
611 int ret;
612 struct trace_seq *s = &iter->seq;
613 struct trace_entry *entry = iter->ent,
614 *next_entry = trace_find_next_entry(iter, NULL,
615 &next_ts);
616 unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE);
617 unsigned long abs_usecs = ns2usecs(iter->ts - iter->tr->time_start);
618 unsigned long rel_usecs;
619
620 if (!next_entry)
621 next_ts = iter->ts;
622 rel_usecs = ns2usecs(next_ts - iter->ts);
623
624 if (verbose) {
625 char comm[TASK_COMM_LEN];
626
627 trace_find_cmdline(entry->pid, comm);
628
629 ret = trace_seq_printf(s, "%16s %5d %3d %d %08x %08lx [%08llx]"
630 " %ld.%03ldms (+%ld.%03ldms): ", comm,
631 entry->pid, iter->cpu, entry->flags,
632 entry->preempt_count, iter->idx,
633 ns2usecs(iter->ts),
634 abs_usecs / USEC_PER_MSEC,
635 abs_usecs % USEC_PER_MSEC,
636 rel_usecs / USEC_PER_MSEC,
637 rel_usecs % USEC_PER_MSEC);
638 } else {
639 ret = lat_print_generic(s, entry, iter->cpu);
640 if (ret)
641 ret = lat_print_timestamp(s, abs_usecs, rel_usecs);
642 }
643
644 return ret;
645 }
646
647 static const char state_to_char[] = TASK_STATE_TO_CHAR_STR;
648
649 static int task_state_char(unsigned long state)
650 {
651 int bit = state ? __ffs(state) + 1 : 0;
652
653 return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?';
654 }
655
656 /**
657 * ftrace_find_event - find a registered event
658 * @type: the type of event to look for
659 *
660 * Returns an event of type @type otherwise NULL
661 * Called with trace_event_read_lock() held.
662 */
663 struct trace_event *ftrace_find_event(int type)
664 {
665 struct trace_event *event;
666 struct hlist_node *n;
667 unsigned key;
668
669 key = type & (EVENT_HASHSIZE - 1);
670
671 hlist_for_each_entry(event, n, &event_hash[key], node) {
672 if (event->type == type)
673 return event;
674 }
675
676 return NULL;
677 }
678
679 static LIST_HEAD(ftrace_event_list);
680
681 static int trace_search_list(struct list_head **list)
682 {
683 struct trace_event *e;
684 int last = __TRACE_LAST_TYPE;
685
686 if (list_empty(&ftrace_event_list)) {
687 *list = &ftrace_event_list;
688 return last + 1;
689 }
690
691 /*
692 * We used up all possible max events,
693 * lets see if somebody freed one.
694 */
695 list_for_each_entry(e, &ftrace_event_list, list) {
696 if (e->type != last + 1)
697 break;
698 last++;
699 }
700
701 /* Did we used up all 65 thousand events??? */
702 if ((last + 1) > FTRACE_MAX_EVENT)
703 return 0;
704
705 *list = &e->list;
706 return last + 1;
707 }
708
709 void trace_event_read_lock(void)
710 {
711 down_read(&trace_event_mutex);
712 }
713
714 void trace_event_read_unlock(void)
715 {
716 up_read(&trace_event_mutex);
717 }
718
719 /**
720 * register_ftrace_event - register output for an event type
721 * @event: the event type to register
722 *
723 * Event types are stored in a hash and this hash is used to
724 * find a way to print an event. If the @event->type is set
725 * then it will use that type, otherwise it will assign a
726 * type to use.
727 *
728 * If you assign your own type, please make sure it is added
729 * to the trace_type enum in trace.h, to avoid collisions
730 * with the dynamic types.
731 *
732 * Returns the event type number or zero on error.
733 */
734 int register_ftrace_event(struct trace_event *event)
735 {
736 unsigned key;
737 int ret = 0;
738
739 down_write(&trace_event_mutex);
740
741 if (WARN_ON(!event))
742 goto out;
743
744 INIT_LIST_HEAD(&event->list);
745
746 if (!event->type) {
747 struct list_head *list = NULL;
748
749 if (next_event_type > FTRACE_MAX_EVENT) {
750
751 event->type = trace_search_list(&list);
752 if (!event->type)
753 goto out;
754
755 } else {
756
757 event->type = next_event_type++;
758 list = &ftrace_event_list;
759 }
760
761 if (WARN_ON(ftrace_find_event(event->type)))
762 goto out;
763
764 list_add_tail(&event->list, list);
765
766 } else if (event->type > __TRACE_LAST_TYPE) {
767 printk(KERN_WARNING "Need to add type to trace.h\n");
768 WARN_ON(1);
769 goto out;
770 } else {
771 /* Is this event already used */
772 if (ftrace_find_event(event->type))
773 goto out;
774 }
775
776 if (event->trace == NULL)
777 event->trace = trace_nop_print;
778 if (event->raw == NULL)
779 event->raw = trace_nop_print;
780 if (event->hex == NULL)
781 event->hex = trace_nop_print;
782 if (event->binary == NULL)
783 event->binary = trace_nop_print;
784
785 key = event->type & (EVENT_HASHSIZE - 1);
786
787 hlist_add_head(&event->node, &event_hash[key]);
788
789 ret = event->type;
790 out:
791 up_write(&trace_event_mutex);
792
793 return ret;
794 }
795 EXPORT_SYMBOL_GPL(register_ftrace_event);
796
797 /*
798 * Used by module code with the trace_event_mutex held for write.
799 */
800 int __unregister_ftrace_event(struct trace_event *event)
801 {
802 hlist_del(&event->node);
803 list_del(&event->list);
804 return 0;
805 }
806
807 /**
808 * unregister_ftrace_event - remove a no longer used event
809 * @event: the event to remove
810 */
811 int unregister_ftrace_event(struct trace_event *event)
812 {
813 down_write(&trace_event_mutex);
814 __unregister_ftrace_event(event);
815 up_write(&trace_event_mutex);
816
817 return 0;
818 }
819 EXPORT_SYMBOL_GPL(unregister_ftrace_event);
820
821 /*
822 * Standard events
823 */
824
825 enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags)
826 {
827 return TRACE_TYPE_HANDLED;
828 }
829
830 /* TRACE_FN */
831 static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags)
832 {
833 struct ftrace_entry *field;
834 struct trace_seq *s = &iter->seq;
835
836 trace_assign_type(field, iter->ent);
837
838 if (!seq_print_ip_sym(s, field->ip, flags))
839 goto partial;
840
841 if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) {
842 if (!trace_seq_printf(s, " <-"))
843 goto partial;
844 if (!seq_print_ip_sym(s,
845 field->parent_ip,
846 flags))
847 goto partial;
848 }
849 if (!trace_seq_printf(s, "\n"))
850 goto partial;
851
852 return TRACE_TYPE_HANDLED;
853
854 partial:
855 return TRACE_TYPE_PARTIAL_LINE;
856 }
857
858 static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags)
859 {
860 struct ftrace_entry *field;
861
862 trace_assign_type(field, iter->ent);
863
864 if (!trace_seq_printf(&iter->seq, "%lx %lx\n",
865 field->ip,
866 field->parent_ip))
867 return TRACE_TYPE_PARTIAL_LINE;
868
869 return TRACE_TYPE_HANDLED;
870 }
871
872 static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags)
873 {
874 struct ftrace_entry *field;
875 struct trace_seq *s = &iter->seq;
876
877 trace_assign_type(field, iter->ent);
878
879 SEQ_PUT_HEX_FIELD_RET(s, field->ip);
880 SEQ_PUT_HEX_FIELD_RET(s, field->parent_ip);
881
882 return TRACE_TYPE_HANDLED;
883 }
884
885 static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags)
886 {
887 struct ftrace_entry *field;
888 struct trace_seq *s = &iter->seq;
889
890 trace_assign_type(field, iter->ent);
891
892 SEQ_PUT_FIELD_RET(s, field->ip);
893 SEQ_PUT_FIELD_RET(s, field->parent_ip);
894
895 return TRACE_TYPE_HANDLED;
896 }
897
898 static struct trace_event trace_fn_event = {
899 .type = TRACE_FN,
900 .trace = trace_fn_trace,
901 .raw = trace_fn_raw,
902 .hex = trace_fn_hex,
903 .binary = trace_fn_bin,
904 };
905
906 /* TRACE_CTX an TRACE_WAKE */
907 static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
908 char *delim)
909 {
910 struct ctx_switch_entry *field;
911 char comm[TASK_COMM_LEN];
912 int S, T;
913
914
915 trace_assign_type(field, iter->ent);
916
917 T = task_state_char(field->next_state);
918 S = task_state_char(field->prev_state);
919 trace_find_cmdline(field->next_pid, comm);
920 if (!trace_seq_printf(&iter->seq,
921 " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
922 field->prev_pid,
923 field->prev_prio,
924 S, delim,
925 field->next_cpu,
926 field->next_pid,
927 field->next_prio,
928 T, comm))
929 return TRACE_TYPE_PARTIAL_LINE;
930
931 return TRACE_TYPE_HANDLED;
932 }
933
934 static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags)
935 {
936 return trace_ctxwake_print(iter, "==>");
937 }
938
939 static enum print_line_t trace_wake_print(struct trace_iterator *iter,
940 int flags)
941 {
942 return trace_ctxwake_print(iter, " +");
943 }
944
945 static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
946 {
947 struct ctx_switch_entry *field;
948 int T;
949
950 trace_assign_type(field, iter->ent);
951
952 if (!S)
953 S = task_state_char(field->prev_state);
954 T = task_state_char(field->next_state);
955 if (!trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
956 field->prev_pid,
957 field->prev_prio,
958 S,
959 field->next_cpu,
960 field->next_pid,
961 field->next_prio,
962 T))
963 return TRACE_TYPE_PARTIAL_LINE;
964
965 return TRACE_TYPE_HANDLED;
966 }
967
968 static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags)
969 {
970 return trace_ctxwake_raw(iter, 0);
971 }
972
973 static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags)
974 {
975 return trace_ctxwake_raw(iter, '+');
976 }
977
978
979 static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
980 {
981 struct ctx_switch_entry *field;
982 struct trace_seq *s = &iter->seq;
983 int T;
984
985 trace_assign_type(field, iter->ent);
986
987 if (!S)
988 S = task_state_char(field->prev_state);
989 T = task_state_char(field->next_state);
990
991 SEQ_PUT_HEX_FIELD_RET(s, field->prev_pid);
992 SEQ_PUT_HEX_FIELD_RET(s, field->prev_prio);
993 SEQ_PUT_HEX_FIELD_RET(s, S);
994 SEQ_PUT_HEX_FIELD_RET(s, field->next_cpu);
995 SEQ_PUT_HEX_FIELD_RET(s, field->next_pid);
996 SEQ_PUT_HEX_FIELD_RET(s, field->next_prio);
997 SEQ_PUT_HEX_FIELD_RET(s, T);
998
999 return TRACE_TYPE_HANDLED;
1000 }
1001
1002 static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags)
1003 {
1004 return trace_ctxwake_hex(iter, 0);
1005 }
1006
1007 static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags)
1008 {
1009 return trace_ctxwake_hex(iter, '+');
1010 }
1011
1012 static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
1013 int flags)
1014 {
1015 struct ctx_switch_entry *field;
1016 struct trace_seq *s = &iter->seq;
1017
1018 trace_assign_type(field, iter->ent);
1019
1020 SEQ_PUT_FIELD_RET(s, field->prev_pid);
1021 SEQ_PUT_FIELD_RET(s, field->prev_prio);
1022 SEQ_PUT_FIELD_RET(s, field->prev_state);
1023 SEQ_PUT_FIELD_RET(s, field->next_pid);
1024 SEQ_PUT_FIELD_RET(s, field->next_prio);
1025 SEQ_PUT_FIELD_RET(s, field->next_state);
1026
1027 return TRACE_TYPE_HANDLED;
1028 }
1029
1030 static struct trace_event trace_ctx_event = {
1031 .type = TRACE_CTX,
1032 .trace = trace_ctx_print,
1033 .raw = trace_ctx_raw,
1034 .hex = trace_ctx_hex,
1035 .binary = trace_ctxwake_bin,
1036 };
1037
1038 static struct trace_event trace_wake_event = {
1039 .type = TRACE_WAKE,
1040 .trace = trace_wake_print,
1041 .raw = trace_wake_raw,
1042 .hex = trace_wake_hex,
1043 .binary = trace_ctxwake_bin,
1044 };
1045
1046 /* TRACE_SPECIAL */
1047 static enum print_line_t trace_special_print(struct trace_iterator *iter,
1048 int flags)
1049 {
1050 struct special_entry *field;
1051
1052 trace_assign_type(field, iter->ent);
1053
1054 if (!trace_seq_printf(&iter->seq, "# %ld %ld %ld\n",
1055 field->arg1,
1056 field->arg2,
1057 field->arg3))
1058 return TRACE_TYPE_PARTIAL_LINE;
1059
1060 return TRACE_TYPE_HANDLED;
1061 }
1062
1063 static enum print_line_t trace_special_hex(struct trace_iterator *iter,
1064 int flags)
1065 {
1066 struct special_entry *field;
1067 struct trace_seq *s = &iter->seq;
1068
1069 trace_assign_type(field, iter->ent);
1070
1071 SEQ_PUT_HEX_FIELD_RET(s, field->arg1);
1072 SEQ_PUT_HEX_FIELD_RET(s, field->arg2);
1073 SEQ_PUT_HEX_FIELD_RET(s, field->arg3);
1074
1075 return TRACE_TYPE_HANDLED;
1076 }
1077
1078 static enum print_line_t trace_special_bin(struct trace_iterator *iter,
1079 int flags)
1080 {
1081 struct special_entry *field;
1082 struct trace_seq *s = &iter->seq;
1083
1084 trace_assign_type(field, iter->ent);
1085
1086 SEQ_PUT_FIELD_RET(s, field->arg1);
1087 SEQ_PUT_FIELD_RET(s, field->arg2);
1088 SEQ_PUT_FIELD_RET(s, field->arg3);
1089
1090 return TRACE_TYPE_HANDLED;
1091 }
1092
1093 static struct trace_event trace_special_event = {
1094 .type = TRACE_SPECIAL,
1095 .trace = trace_special_print,
1096 .raw = trace_special_print,
1097 .hex = trace_special_hex,
1098 .binary = trace_special_bin,
1099 };
1100
1101 /* TRACE_STACK */
1102
1103 static enum print_line_t trace_stack_print(struct trace_iterator *iter,
1104 int flags)
1105 {
1106 struct stack_entry *field;
1107 struct trace_seq *s = &iter->seq;
1108 int i;
1109
1110 trace_assign_type(field, iter->ent);
1111
1112 if (!trace_seq_puts(s, "<stack trace>\n"))
1113 goto partial;
1114 for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
1115 if (!field->caller[i] || (field->caller[i] == ULONG_MAX))
1116 break;
1117 if (!trace_seq_puts(s, " => "))
1118 goto partial;
1119
1120 if (!seq_print_ip_sym(s, field->caller[i], flags))
1121 goto partial;
1122 if (!trace_seq_puts(s, "\n"))
1123 goto partial;
1124 }
1125
1126 return TRACE_TYPE_HANDLED;
1127
1128 partial:
1129 return TRACE_TYPE_PARTIAL_LINE;
1130 }
1131
1132 static struct trace_event trace_stack_event = {
1133 .type = TRACE_STACK,
1134 .trace = trace_stack_print,
1135 .raw = trace_special_print,
1136 .hex = trace_special_hex,
1137 .binary = trace_special_bin,
1138 };
1139
1140 /* TRACE_USER_STACK */
1141 static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
1142 int flags)
1143 {
1144 struct userstack_entry *field;
1145 struct trace_seq *s = &iter->seq;
1146
1147 trace_assign_type(field, iter->ent);
1148
1149 if (!trace_seq_puts(s, "<user stack trace>\n"))
1150 goto partial;
1151
1152 if (!seq_print_userip_objs(field, s, flags))
1153 goto partial;
1154
1155 return TRACE_TYPE_HANDLED;
1156
1157 partial:
1158 return TRACE_TYPE_PARTIAL_LINE;
1159 }
1160
1161 static struct trace_event trace_user_stack_event = {
1162 .type = TRACE_USER_STACK,
1163 .trace = trace_user_stack_print,
1164 .raw = trace_special_print,
1165 .hex = trace_special_hex,
1166 .binary = trace_special_bin,
1167 };
1168
1169 /* TRACE_BPRINT */
1170 static enum print_line_t
1171 trace_bprint_print(struct trace_iterator *iter, int flags)
1172 {
1173 struct trace_entry *entry = iter->ent;
1174 struct trace_seq *s = &iter->seq;
1175 struct bprint_entry *field;
1176
1177 trace_assign_type(field, entry);
1178
1179 if (!seq_print_ip_sym(s, field->ip, flags))
1180 goto partial;
1181
1182 if (!trace_seq_puts(s, ": "))
1183 goto partial;
1184
1185 if (!trace_seq_bprintf(s, field->fmt, field->buf))
1186 goto partial;
1187
1188 return TRACE_TYPE_HANDLED;
1189
1190 partial:
1191 return TRACE_TYPE_PARTIAL_LINE;
1192 }
1193
1194
1195 static enum print_line_t
1196 trace_bprint_raw(struct trace_iterator *iter, int flags)
1197 {
1198 struct bprint_entry *field;
1199 struct trace_seq *s = &iter->seq;
1200
1201 trace_assign_type(field, iter->ent);
1202
1203 if (!trace_seq_printf(s, ": %lx : ", field->ip))
1204 goto partial;
1205
1206 if (!trace_seq_bprintf(s, field->fmt, field->buf))
1207 goto partial;
1208
1209 return TRACE_TYPE_HANDLED;
1210
1211 partial:
1212 return TRACE_TYPE_PARTIAL_LINE;
1213 }
1214
1215
1216 static struct trace_event trace_bprint_event = {
1217 .type = TRACE_BPRINT,
1218 .trace = trace_bprint_print,
1219 .raw = trace_bprint_raw,
1220 };
1221
1222 /* TRACE_PRINT */
1223 static enum print_line_t trace_print_print(struct trace_iterator *iter,
1224 int flags)
1225 {
1226 struct print_entry *field;
1227 struct trace_seq *s = &iter->seq;
1228
1229 trace_assign_type(field, iter->ent);
1230
1231 if (!seq_print_ip_sym(s, field->ip, flags))
1232 goto partial;
1233
1234 if (!trace_seq_printf(s, ": %s", field->buf))
1235 goto partial;
1236
1237 return TRACE_TYPE_HANDLED;
1238
1239 partial:
1240 return TRACE_TYPE_PARTIAL_LINE;
1241 }
1242
1243 static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags)
1244 {
1245 struct print_entry *field;
1246
1247 trace_assign_type(field, iter->ent);
1248
1249 if (!trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf))
1250 goto partial;
1251
1252 return TRACE_TYPE_HANDLED;
1253
1254 partial:
1255 return TRACE_TYPE_PARTIAL_LINE;
1256 }
1257
1258 static struct trace_event trace_print_event = {
1259 .type = TRACE_PRINT,
1260 .trace = trace_print_print,
1261 .raw = trace_print_raw,
1262 };
1263
1264
1265 static struct trace_event *events[] __initdata = {
1266 &trace_fn_event,
1267 &trace_ctx_event,
1268 &trace_wake_event,
1269 &trace_special_event,
1270 &trace_stack_event,
1271 &trace_user_stack_event,
1272 &trace_bprint_event,
1273 &trace_print_event,
1274 NULL
1275 };
1276
1277 __init static int init_events(void)
1278 {
1279 struct trace_event *event;
1280 int i, ret;
1281
1282 for (i = 0; events[i]; i++) {
1283 event = events[i];
1284
1285 ret = register_ftrace_event(event);
1286 if (!ret) {
1287 printk(KERN_WARNING "event %d failed to register\n",
1288 event->type);
1289 WARN_ON_ONCE(1);
1290 }
1291 }
1292
1293 return 0;
1294 }
1295 device_initcall(init_events);
Linux kernel - Deliverables
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